Film scanning method

Abstract

A film scanning method is provided. When the film is judged as a negative film, the scanning device sets the scan exposure time for the film according to the base background color of the film. The negative film is scanned for the scan exposure time, wherein, the film passes through the scanning device at one time so as to complete the above judge of the film type and scanning of the film. The film scanning method automatically completes the recognition of film type, performs accurate scanning based on the scan exposure time, expands the dynamic range and reduces noise impacts, so as to obtain a scanned image with higher accuracy.

Description

[0001]This application claims the benefit of People's Republic of China application Serial No. 200910205136.5, filed Sep. 28, 2009, the subject matter of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates in general to a film scanning technology, and more particularly to a film scanning method capable of scanning and recognizing a film to obtain a clear film scan image through a single scanning.[0004]2. Description of the Related Art[0005]The film scanner is currently directed towards the integration of many film scanning functions, such as reading the positive film (the reversal film or the slide film) as well as the negative film (the black / white film and the color film). High accuracy in color recovery is expected on the film scanner. Since the film itself carries a base background color, manual color correction is needed during scanning. Films from different manufacturers usually have different base bac...

AI Technical Summary

Benefits of technology

[0017]The film scanning method is adapted to a multi-function scanning device or a multi-function film scanning device for obtaining the base background color value of a film, that is, the RGB averages, according to the determination of scanning the film base in a positive film mode to determine whether the film type belongs to one of the positive film, the black / white negative film and the color negative film. The scanning device automatically confirms the subsequent scanning program according to the film type. As for scanning of the negative film, a preferred scan exposure time is related to a specific range of the base background color value of the film so that accurate scanning of each film is implemented. The scanning device automatically performs accurate adjustment on the scan exposure time according to the type and the base color of the film, and performs automatic marking on the scanned film according to the set boundary marking threshold, so as to obtain a scanned result with reasonable exposure and hues and so as to confirm the scan boundary.

[0020]During scanning, the scanning device effectively expands the dynamic range and reduces noise impacts by automatically adjusting the exposure time for the negative film. Based on the individual RGB averages of the base and the exposure time, the scanning device calculates the optimum exposure time under the negative film mode for which the individual RGB averages are optimum, so as to confirm / set the boundary marking threshold. As for the black / white negative film, one of the RGB color values is confirmed according to the above mode, and on the basis of the confirmed optimum exposure time, other two color values are adjusted, and the optimum color value parameter is selected.

[0023]Embodiments of the invention have the following benefits: the film scanning method automatically completes the recognition of film type and performs accurate scanning based on the scan exposure time, expands the dynamic range, and reduces noise impacts so as to obtain a scan image with higher accuracy.

Problems solved by technology

Therefore, during negative scanning, scanning calibration cannot be performed through the use of standard color sheet which is applicable in the scanning of an ordinary photo.

However, there is difference in accuracy between manual color calibration result and the optimum color of the film itself.

Meanwhile, aberration even exists in the films of the same model from the same manufacturer.

Therefore, accurate recovery of film scanning cannot be implemented just through the recognition of the manufacturers and the film type.

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